Magnification of a thin lens

An object is placed  cm to the left a converging lens with a focal length  cm. The lens is at $x=$ 0  cm and the object is at $x_o = $  cm.

  • At which distance $x_i$ from the lens we need to put the viewing screen to observe an in-focus image? $x_i=$  cm
  • What is the magnification of the image? Is it a real or virtual image?   $m_{1}=$

If $x_i -x_o > 4f$ (*), we can move the lens by an amount of $e$ along the optical axis to obtain a second image on the screen. If the condition (*) holds:

  • What is the magnification of the second image?   $m_{2}=$
  • For which lens position do we get the larger magnification?

Use the APP Real and virtual images to check your results.